Is logging into many Pinterest/Twitter accounts a dangerous activity?

I am wondering about the policies of Twitter and Pinterest. Whether they suspend accounts when they're being accessed by an IP that mass accesses accounts. Or whether they ban that IP. So I'm not talking about account creation, purely updating or checking accounts..

Note that adblockers might block our captcha, and other functionality on BHW so if you don't see the captcha or see reduced functionality please disable adblockers to ensure full functionality, note we only allow relevant management verified ads on BHW.